Jefferson m



I (No Model.) 5

' J. M; GLOUGH.

MACHINE FOR FiNIsHING GUN BARRELS.

No. 337,247. Patented Mar. '2, 1886.;

Co n .UNITE Srrns ATENT rrrca.

JEFFERSON M. CLOUGH, OF NE\V HAVEN, CONNECTICUT, ASSIGNOR TO THE WINCHESTER REPEATING ARMS COMPANY, OF SAME PLACE.

MACHINE FOR FlNlSHlN G GUN-BARRELS.

SPECIFICATION forming part of Letters Patent No. 337,2l7, dated March 2, 1886.

Application filed October 5, 1885. Serial No. 178,958. No model.)

To aZZ whom it may concern:

Be it known that I, JEFFERSON M. OLoUeH, of New Haven, in the county of New Haven and State of Connecticut, have invented new 5 Improvements in Machines for Finishing Gun- Barrels; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure l, aperspective view of the machine; Fig.2, a vertical section through the j aws, showing side view of the polishing-wheel enlarged; Fig. 3, a front view of the jaws enlarged; Fig. Fig. 4, a detached view of the jaws, illustrating the method of clamping the barrel; Fig. 5, a detached end view of the cheeks, showing them as grasping the barrel; Fig. 6, a modification.

This invention relates to a machine for finishing the surface of barrels for fire arms which are of polygonal shape in transverse 2 section, usually octagonal. The surfaceuequires to be finely finished, and in the perfection of finish the angles should be sharp and clearly defined. In the usual method of finishing such barrels the grinding and polish- 0 ing are done on a wheel having its axis parallel with the barrel, and so that the surface to be finished is presented to the periphery of the wheel. In some cases the grinding or polishing wheel revolves upon an axis at right 5 angles to theaxis of the barrel, the periphery of the wheel working upon the surface to be polished, and so that the wheel operates upon an exceedingly short portion of the surface. In either case it is extremely difficult to pre- 0 serveasharp and clearly-defined angle straight throughout, and, it is also difficult to preserve an equality in the width of the several sides, which is very desirable. In some cases the sides of the barrel are finished by hand with 5 a tool drawn over the surface; but in such method of finishing the same difficulty exists.

The object of my invention is the construction of a machine in which the sides of the barrel may be presented to the surface of the grinding-wheel, the said surface being in a plane at right angles to the axis of its revolution, and in such a machine, as hereinafter described and particularly recited in the claims, my invention consists.

A represents the bed, upon which the carriage B is arranged upon longitudinal guides at a, and so that the carriage may travel longitudinally on the bed. The means of moving the carriage on the bed may be any of the known devices for mechanically imparting such longitudinal movement, or the carriage may be moved by hand.

On the carriage two heads, 0 D, are arranged adjustably in a guideway, b, and arranged to be secured at any desirable points on the carriage distant from each other. Such securing may be done by screw or bolt d, or otherwise. One of the heads, D, is provided with a fixed center, 6, the other with an adjustable center, f, these centers being similar to those employed in lathes, not necessary to be particulary described further than to say that the two centers are adapted to support the barrel to be finished by its two ends, and

so that the barrel may be rotated thereon, 7 maintaining its constant axial line with the said centers. At a point midway between the two heads a clamping-support for the' barrel is arranged. This is best made as a standard, E, secured to the carriage. Vertically in the standard two slides, F G, are arranged, and in the top of the standard a vertical leadingscrew, H, is arranged, supported against longitudinal movement, as seen in Fig. 2, but free for rotation, and is rotated by means of a handle on the upper end of the screw, or otherwise. The body of the screw is threaded, one portion, left-hand,

and the other portion, h, right-hand. The portion 9 works into a corresponding thread in o an arm, L, extending from the slide G. The other portion, h, of the screw works into a similar arm, M, extending from the slide F, as seen in Fig. 2, and so that turning the screw H in one direction one of the slides will be moved up and the other down, or in the opposite direction a reverse movement will be imparted to the slides. The pitch of the threads being equal, the movement of the slides is correspondingly equal. At the lower end of the too slide F a jaw, N, is arranged, preferably upon a pivot, i, and so as to swing in a vertical plane, and above this jaw N, and on the slide G, is a like jaw, O, hung upon a pivot, t, the two jaws in substantially the same plane, the pivots permitting a rocking movement of the aws.

As the leading'screw H is turned to move the slides F G, the jaws N O are moved toward or from each other, according to the direction in which the screw is turned. The central line between these jaws should be the central line between the two centers.

On the bed at right angles to the carriage y, B a spindle, P, is arranged in bearings R R,

the central line of the spindle being, prefer ably, substantially in the plane of the central line between the two centers 6 f, parallel with the plane of the face of the jaws. dle extends toward the jaws O N, and on its inner end the polishingwheel S is fixed. Rapid rotation is imparted to the wheel through power applied to a pulley, T, on the spindle P, or otherwise. The face or side of thewheel next the jaws is a fiat plane.

Polygonal-shaped barrels are usually made tapering from breech to muzzle; but in some cases the diameter is equal throughout.

The barrel to be finished is arranged between. and supported by the two centers 3 f, the barrel being first brought to substantially the required polygonal shape-say octagonal.

When thus supported by the centers, the jaws:

I the barrel travels longitudinally, and so as to presenttheentire length of the barrel to the wheel, and that surface is ground by the flat side of the polishingwheel, the wheel being adj ustedin the proper relation to the barrel, so that the side will be ground or finished in proper relation to the axis of the barrel. One side ground-that is to say, the side marked 1 in Fig. 4--the barrel is given ahalf-rotation to present the side 2 to the face of the wheel, and that sideground in like manner. Then the barrel is given one-fourth of a revolution, andso as to present the side 3 to the wheel, the ground faces 1 and 2 being then taken by the clamps. The side 3 finished, a half-revolution isimparted to the barrel and the side 4. is presented to thewheel, andthat side finished, thus finishing the four sides which are at right angles to each other. )Ihis done, new cheeks j is are arranged inthe jaws, as indicated in broken lines, Fig. 1. and as. seen in Fig. 5. The face of these cheeks, longitudinally, is constructed with a .V -shaped groovethat is to say, a groove which. will present two sides, at n, inclined to each other, the inclination being a right angle,

The spin jaws.

and so that each of the cheeks will embrace two of the finished sides of the barrel. The barrel is turned to present one of the unfinished sides outward-say 5, as seen in Fig. 5- the finished sides 1 and 4 upward, and 2 and 3 downward. The cheeksj k are brought upon those sides, and locate the side 5 in proper relation to thepolishing-wheel, and so that that side 5 is finished. Then aone-fourth revolution of the barrel will bring the side 6 to the front, the jaws again grasping two of the first-finished sides, and the side 6 finished, the side 7 will be in like manner presented and finished, and, finally, the side 8. The two first sides having been finished become guides for the support of the two sides at right angles thereto, and then the four sides, with the cheeks j la, become guides for the support of theintermediate or other four sides,and the sidesofthebarrel must necessarily be equal, and the angles more perfect throughout thancan be produced under the usual lllefllOdSOf finishing such barrels. The checks j k are adapted to be placed between the jaws, as indicated in broken lines, Fig. 1, without change of the fiatface of the In case of a barrel of equal diameter throughout, the axial line through the centers which support the barrel willbe parallel to the face of thepolishing-wheel S; but in caseof a tapering barrel, then the carriage must beadjusted accordingly. To dothis, I make that part of the carriage which supports the centers adjustable transversely, say as by a bolt and transverse slot at its two ends, or, otherwise, the slot and bolt appearing only at one end in Fig. 1, the slot and boltat the other end being hidden, whereby the carriage may only. I

In case the barrel isof equal diameter throughout, the jaws maybe made rigid or without the rocking movement-that is, substantially an integral part ofthe slides. This construction does not require illustration, as

in this. modification the jaws may be CQDSld.-.

ered as such integral part of the respective slides. y

I have representedthe carriage B, which supports the barrel, as movable longitudinally,

to present the barrel throughout its length to the side of the polishing-wheel, the wheel being supported on a shaft in stationary bearings; but this order may bereversed-the supports for the barrel stationary, and. the polishing-wheel supports to travel, as indicated support the barrel at opposite ends, a pair of jaws between said supports, the faces of the said jaws being the one upon one side and the other upon the opposite side of the axial line between said centers, said jaws adapted to be moved toward or from each other to clamp or release the barrel, a polishing-wheel arrangedupon an axis at substantially right angles to the said axial line between said centers, the side or plane of said wheel at right angles to the surface of the barrel held by said jaws, substantially as described.

2. In a machine for polishing gun-barrels, the combination of a pair of centers adapted to support the barrel at opposite ends, a pair of jaws between said supports, the faces of the saidjaws being the one upon one side and the other upon the opposite side of the axial line between said centers, said jaws adapted to be moved toward or from each other to clamp or release the barrel, a polishing-wheel arranged upon an axis at substantially right angles to the said axial line between said centers, the side or plane of said wheel at right angles to thesurface of the barrel held by said jaws,and a pair of cheeks, j 70, adapted to be placed one upon onejaw and the other upon the opposite jaw, the said cheeks constructed with a longitudinal V-shaped groove on their adjacent surfaces, the sides of the said grooves being at substantially right angles to each other and substantially as described.

3. The combination of a carriage, B, arranged and movable upon longitudinal guides, heads 0 D, arranged upon said carriage, each carrying a center in axial line the one with the other, the intermediate vertical slides, F G, vertical leading-screw H, having a right and left hand threaded portion,the right-handthreaded portion working in a correspondingly-threaded projection from the one slide, and the left-hand portion in a correspondingly-threaded projection from the other slide, the said slides carrying the one a jaw, N, and

the other a j aw, O, the one above and the other below the axial line between said centers, the faces of said jaws each presenting a plane surface, and a polishing-wheel, S, arranged upon an axis at substantially right angles to said axial line between said centers, the said axis being in a plane parallel with the plane of the face of said jaws, and whereby the flat face of said polishing-wheel is substantially parallel with the axial line between said centers, sub stantially as described.

4. The combination of a carriage, B, arranged and movable upon longitudinal guides, heads 0 D,arranged upon said carriage, each carrying a center in axial line the one with the other, the intermediate vertical slides, F G, vertical leading screw H, having a right and left hand threaded portion, the righthand threaded portion working in a correspondingly-th readed projection from the one slide,and the left-hand portion in a correspondingly-threaded projection from the other slide, the said slides carrying the one a jaw, N, and the other a jaw, O, the one above and the other below the axial line between said centers, the faces of said jaws each presenting a plane surface, and a polishing-wheel, S, arranged upon an axis at substantially right angles to said axial line between said centers, the said axis being in a plane parallel with the plane of the face of said jaws, and whereby the fiat face of said polishing-wheel is substantially parallel with the axial line between said centers, and the checks k, adapted to be placed between said jaws, the adjacent faces of said cheeks each constructed with a longitudinal groove,the sides of each of said grooves being at right angles to each other, substantially as described.

JEFFERSON M. OLOUGH.

lVitnesses:

DANIEL H. VEADER, A. W. EARLE. 

